Bobbin for sewing-machine shuttles



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liter CHARLES E. WILKINSON, OF

MATTEAWAN, NEV YORK.

BOBBEN FOR SEWING-*MACHENE SHUTTLES.

QPECIPICATION forming part of Letters Patent No. 391,672, dated Dotober23, 1888.

(No model.)

To all whom it may concern:

Be it known that I, CHARLES E. WILKINsON, of Matteawan, in the county ofDutchess and State of New York, have invented a new and usefulImprovement in Sewing-Machine Bobbins, ofwhich the following is aspecification.

M y invention is applicable more particularly to I those bobbins whichare to be employed in shuttles or bobbin-cases such as are used in theSinger and Wheeler & Vilson machines, and which have a diameterconsiderably greater than their length, so as to be received in thecavities which are provided in the shuttles or bobbin-cases of suchmachines.

Theinvention relates to those bobbins which are composed of thread woundupon a tube such as one of paper-which may be thrown away after use, andmetal heads which are applied to opposite ends of the tube and onopposite sides of the thread. This construction of bobbin enables thesale of bobbins of thread already wound for use in quantity to theconsumer, and the consumer has, when one bobbin of thread is used up,only to detach the metal heads therefrom and attach them to a new bobbinof thread inorder to proceed with the work in hand.

The invention will be hereinafter described, and then pointed out in theclaim.

In the accompanying drawings, Figure 1 is an axial section of abobbinembodying my invention, the heads being applied ready for use. Fig. 2 isa similar section of the bobbin as sold and destitute of heads. Figs. 8and 1 are axial sections of the two heads, and Fig. 5 is a sec tion ofthe bobbin with: its heads and inserted in the cavity of a shuttle orbobbin casc.

Similar letters of reference designate corresponding parts in theseveral figures.

The bobbin, as sold by the manufacturer to he dealer and by the dealerto the consumer, is illustrated in Fig. 2, and consists simply of thread6 wound upon a tube, (6, which is substantially the length of thebobbin. The thread I) unwinds from the outside of the bobbin as from anordinary spool, and the tube a is of paper or of some other material socheap that it is never reused but is thrown away when the thread on thebobbin is exhausted.

To enable bobbins of this character to operate properly in the shuttleor bobbin-case G- such as is shown in Fig. 5it is necessary to combineother parts, which are usually of metal, therewith. The necessary partsare formed by two heads, Asuch as are shown in Figs.3 and 4i-and eachhaving projecting from its center ashort tube section or neck,a. Theseheads may be made of very thin metal with their tube sections or necks aintegral with the heads, and they may be of slightly concavoconvex form,as shown in Figs. 3 and 4.

The consumer, when desiring to use a bobbin, enters the short tubesections or necks o of the two heads into the opposite ends of the papertube a and presses them firmly until the two heads A come against theopposite ends of the bobbin, as is shown in Fig. 1, and to enable themto be there retained the tube sections or necks a should fit withcomparative tightness in the paper tube a, so as to be retained there inafter they are pressed into place.

The shuttle or bobbincase G has the usual approximately-circularcavity,C,forreceiving the bobbin, andit is shown as having a post, 0,projecting centrally lengthwise of the cavity 0, and upon this post 0,which is here shown as tubular, the bobbin rotates as upon a journal. Itwill be observed that when the heads A are pressed into position onopposite ends of the bobbin the tube sections or necks a substantiallymeet at the center of the length of the bobbin, and these tube sectionsor necks form a perfect surface for turning upon the post 0.

When the thread of a bobbin is exhausted, all that is necessary is towithdraw the heads from the tube a, which is thrown away, and to pressthem into proper position on a new bobbin which is placed in the shuttleor bobbincase, as before, and work proceeded with.

In some cases the shuttle or bobbin-case C may be destitute of a post,0, and the bobbin may rest and turn on the edges of the heads A.

According to my invention the necks or tube sections a of the heads Aare of uniform external diameter, so that they both snugly fit the tubea when inserted thereinto from opposite ends, and they have noconnection with each other save by the tube a.

I am aware that bobbi us of thread have been made before my invention bywinding a tube of paper with thread and then applying to opposite sidesthereof two heads, one of which has an internally screw-threaded socketwhich enters the tube, While the other head has an externally-threadedsolid stud which is screwed into said socket.

My construction is distinguished from the old device, which is abovementioned, in having the short tube sections or necks a, which are ofuniform external diameter and enter snugly into the tube a from oppositeends thereof. My heads A, each with its tube section or neck, a, may bestruck up from sheet metal by suitable dies, and no cutting ofscrewthreads is required. Neither in applying the heads to the tubewound with thread is there need of turning them to screw them together,but both may be slipped directly into place.

\Vhat I claim as my invention, and desire to secure by Letters Patent,is

The bobbin herein described,consisting of a tube, a, wound with threadand constructed with a smooth interior surface, in combination with theremovable heads A,separate from and independent of each other, andprovided with necks a,having a smooth exterior surface and a uniformdiameter, both of the said necks fitting snugly into the tube a, fromthe opposite ends thereof, and connected with the tube by frictionalcontact only, substantially as set forth.

CHARLES E. WILKINSON. \Vitnesses:

FREDK. HAYNES, HENRY J. MCBRIDE.

